The Noperthedron does not have Rupert Property: a proof in Lean4

The Lean reference manual

An introduction to theorem proving in Lean for the impatient.

A complete Lean 4 formalization of Erdős Problem 124 using Mathlib.

Minimal CLI coding agent by Mistral

(Mirror) A Machine-to-Machine Interaction System for Lean 4

Eurisko-Inspired Discovery System for Lean in Lean

A Python environment manager built in Lean 4

Dependency visualization and verification for Lean 4 projects

Experiments on automation for Lean

Lean scripts for indexing sorries and verifying proofs

🎒 Token-Oriented Object Notation (TOON) – Compact, human-readable, schema-aware JSON for LLM prompts. Spec, benchmarks, TypeScript SDK.

Lean 4 kernel / 'external checker' written in Lean 4

A Lean4 script for robustly verifying submitted proofs of theorems and implementations of functions

Replay the `Environment` for a given Lean module, ensuring that all declarations are accepted by the kernel.

Lean formalization of aperiodic monotiles papers (staging repository for material not yet in mathlib)

FULL Augment Code, Claude Code, Cluely, CodeBuddy, Comet, Cursor, Devin AI, Junie, Kiro, Leap.new, Lovable, Manus, NotionAI, Orchids.app, Perplexity, Poke, Qoder, Replit, Same.dev, Trae, Traycer AI…

(Mirror) A Music DSL in Lean 4

Claude skills for Lean 4 theorem proving

Terminal-based data visualization library for Lean 4. Port of Granite (Haskell) with type-safe guarantees. Create beautiful charts using Unicode braille characters.

Frontend website for the SorryDB leaderboard

Search and validate pairs of central binomial coefficients with the same prime factors

Factorio overhaul mod with a focus on logistic and automation challenges

Lets make video diffusion practical!

Expanding FramePack into a multifunction video creation tool